Portal:Paleozoic

Cambrian

 * Cambrian Geology and Paleontology Volume 1, 1910 by Charles Doolittle Walcott
 * Cambrian Geology and Paleontology Volume 2, 1914 by Charles Doolittle Walcott
 * "Saporta's World of Plants Before the Appearance of Man", February 1880 by Gaston de Saporta

Ordovician

 * "Description of a New Species of Trilobite", 1875 by Charles Doolittle Walcott.
 * "Notes on Ceraurus pleurexanthemus, Green", 1875 by Charles Doolittle Walcott.
 * "New Species of Trilobite from the Trenton Limestone at Trenton Falls, N. Y.", 1875 by Charles Doolittle Walcott.
 * Notice of the discovery of a Poecilopod in the Utica slate formation, 1882 by Charles Doolittle Walcott.
 * Description of a New Genus of the Order Eurypterida from the Utica Slate, 1882 by Charles Doolittle Walcott

Devonian

 * Eurypterids of the Devonian Holland Quarry Shale of Ohio, 1961 by Erik Norman Kjellesvig-Waering

Carboniferous

 * Carboniferous Eurypterids of Nebraska, 1914 by Erwin Hinckly Barbour
 * Pennsylvanian invertebrates of the Mazon Creek Area, Illinois: Eurypterida, 1963 by Erik Norman Kjellesvig-Waering.